Butterfly dimmer



FIG. 1 is a perspective view of the butterfly dimmer;

FIG. 2 is a front view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a back view thereof.

The broken line showing of the operator panel is for illustrative purpose only and forms no part of the claimed design. 

CLAIM The ornamental design for a butterfly dimmer, as shown and described. 